Thermostat



(No Model.) 2 SheetsSheet 1 I A.M.BARRON.

THERMOSTAT.

No. 446,846. Patented Feb. 24,1891.

2 Sheets-Sheet 2.

A. M. BARRON.

THERMOSTAT.

Patented Feb. 24,1891.

W a W W m (No Mo UNITED STATES PATENT OFFICE.

ADOLPII M. BARRON, OF KANSAS CITY, MISSOURI.

TH ERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 446,846, dated February 24, 1891. Application filed September 19, 1890- Serial No. 365,530. (No model.)

T 0 all whom it may concern:

Be it known that I, ADOLPH M. BARRON, of Kansas City, Jackson county, Missouri, have invented certain new and useful 1m provements in Clhermostats, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to improvements in thermostats for fire-alarm purposes; and it consists in the peculiar combination and arrangement of devices, as will be hereinafter lescribed,and pointed out particnlarlyin the claims.

My object is to provide a simple, cheap, and more effective device of this eharacter,using less wire for the main circuit than is now in use.

Referring to the drawings which illustrate the invention, Figure 1 is a view showing my improved thermostat as arranged for use. Fig. 2 is a a top plan view of the thermostat. Fig. 3 is a vertical sectional view of the same, taken througl'i the binding-posts. Fig. 4 is a vertical sectional view taken on a line 00 0c of Fig. Fig. 5 is a bottom plan view of the thermostat.

A represents a thermostat, consisting of the porcelain base-block 15, provided with a central vertical opening therethrough, in which is secured the casing O, which has a vertical screw-threaded opening D therethrough, in which is adapted to be secured the upper screw contact-point E.

A circular recess, concave when looking toward the bottom, is formed in the disk 13, in which is secured the concave metallic disk F by bolts G, which disk is adapted to expand when subjected to an excessive heat.

A metal cross-bar II is secured to the under surface of the annular flange 1, formed by reccssing the base-block 13 at F by the se curing-screws J J, passing through the baseblock B,and beingin vertical alignmentwith the bindingposts K K, secured in the recesses in the upper surface of base-block B, engage the screw-tl'n'eaded vertical passages L and L therein.

Secured in the upper end of passages L and L in posts K and K are the screws M. 0011- ducting-strap U is connected at one end to the casting C by screw 0, and the opposite end is bent down and under the binding-posts K, said end being provided with a perforation, through which the screw J passes.

The bolts G, which secure the expansion disk in place in the recessed surface of the base-block 3, extend through vertical passages in said base-block land are engaged by nuts 1", resting in recesses in the upper surface of the said disk.

A conducting-strap Q is bent down at either end under the bindingpost K and one of the nuts P, the said ends being provided with perforations, through which pass the screw J of binding-post K and screw-bolt G of disk F, and thus connecting binding-post K and expansion-disk F, as will be readily understood.

An insulator R, of suitable material, prevents contact between screws J and connecting-bar H, thus breaking the circuit, as will be readily understood,when the disk F is not in contact with the lower contact-point S, secured in vertical screw tlireaded passages T of cross-bar H, or with the point E, the former being its normal condition.

The operation of the invention is as follows: The thermostat is suspended from the ceiling of the building in a suitable manner by the connection of the wire with each binding-post. Situated in convenient position in the building is the house-box, shunt-coil, and opencurrent battery. In case of fire or other excessive heat the disk F expands, leaving the lower contact-point S. This causes the current passing from the main battery 1, through main relay 2, to and from house-box 3 to bindingpost K, and the circuit being broken passes through the wire 4 to shunt-coil 5, energizing the same and attracting the armature 6, which completes the open circuit. The trip-coils 7, being thus energized through wire 8, attracts the armature 9, raising the trip-arm l0 and allowing the revolution of the circuit-wheel 11, provided with suitable projections on its periphery, signifying the location of the box, the current returning to the main battery by way of the house-box and main relay, and thus notifying the central office, as will be readily understood. Immediately the disk expands sufficiently to come into contact wit-h upper contact-point E the circuit is completed,the current passing from the bindingpost K, through conducting-strip N to casting 0, through upper point E to expansion-disk F, thence through bolt G, conducting-strap Q, binding-post K, and main wire to main battery. As soon as the current is completed in the manner described the current ceases to pass through wire 4 and energize the shunt-coils 5, and the armature 6 therefore resumes its normal position and the open circuit is broken. \Vhen the armature 6 resumes its normal position, the armature 9 and trip-arm 10, descending, prevent the revolution of the circuit-wheel, as will be readily understood.

Having thus fully described my invention, what I claim as new, and desire to secu e by Letters Patent, is

1. In a thermostatic circuit-controlling device, the combination of an insulating-block having a recessed under surface, a disk sensitive to variations of temperature con- .tained in the said recess, two bindingscrews on the said base, a cross-bar below the said disk, having a contact-point thereon normally in contact with the said disk and connected with one of the said binding-posts,,and a metallic casting in the said block, having a contact-point projecting from its base within the said recess and connected with the said binding-screw, the said disk being connected'with the opposite bindingpost, as described.

2. In a thermostatic circuit-controlling device, the combination of an insulating baseblock having a recessed under surface, a disk sensitive to variations in temperature within the said recess, a bolt passing through the said disk and the base-block, a binding-post upon the said block, and a strip connecting the said bolt and binding-post, a cross-bar spanning the said recess below the said disk and having a contact-point in its upper surface normally in contact therewith, a screw passing through one end of the said bar and insulated therefrom and extending into the said binding-post, a casting within the said block, having a contact-post projecting from its bottom over the said disk,a screw passing through the other end of the said bar and through the block,and abinding-point mounted thereon and connected with the said easting, as described.

In testimony whereof Iat'fix my signature in presence of two witnesses.

ADOLPH M. BARRON. Witnesses:

I]. O. JOHNSON, L. J. HIGDON. 

